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When do you say that a solution is dilute solution?

What do you say that a solution is a concentrated solution?

On passing electric current of one ampere for 16 min and 5 sec through one litre solution of CuCl_(2) , all copper of solution was deposited at cathode. The normality of CuCl_(2) solution was:

On passing electric current of one ampere for 16 min and 5 sec through one litre solution of CuCl_(2) , all copper of solution was deposited at cathode. The normality of CuCl_(2) solution was:

Do the particles of as solute in a colloidal solution go into solution ?